Chapter 11/13 Color and Light

Electromagnetic waves (can/cannot) travel through a vacuum

Can

If the Sun were to disappear rn, we wouldn't know about it for 8 min because it takes 8 min for

Light to travel from Sun to Earth

Relative to the uv waves, the wavelength of infrared waves is

Longer

Red sunsets are the result of the

Longer path of air through which sunlight travels

If a light signal and a radio signal were emitted simultaneously from Alpha Centauri, the first to reach the Earth would be the

Neither. Both would reach Earth at the same time.

When light reflects from a surface, is there a change in its frequency, wavelength, or speed?

No

A laser beam is able to cut through steel because the energy in the beam can be _____ in a small area

concentrated

A ________ mirror produces a virtual image that seems smaller than the object and farther away than it really is

convex

What is the approximate speed of light in a vacuum?

186, 000 miles/ second

A whitish sky is evidence that the atmosphere contains

A mixture of particle sizes

One light source that does not depend on heat is

A neon sign

A band of colors called the visible spectrum can be produced by rays of light passing through

A prism

A variety of sunset colors is evidence for a variety of ______ particles

Atmospheric

The sky appears blue because

Atmospheric particles reflect and scatter blue wavelengths of light

If a red light shines on a green object, the object appears

Black

If you mix the primary colors of PAINT, the result will be

Black

Red, green, and _____ are the primary colors of light

Blue

Optical illusions are actually caused by errors in the

Brain

One important difference between light waves and sound waves is that light waves

Can move through empty space

A pair of colored lights that can be combined to produce white lights are called _______

Complementary

All forms of energy that move through space at a speed of 300,000 km/sec (186, 000 miles/sec) make up the

Electromagnetic spectrum

True or False: Most of the electromagenetic spectrum consists of visible light

False

Different colors of light correspond to different light

Frequencies

If an electron vibrates up and down 1000 times each second, it generates an electromagnetic wave having a _____of 1000 Hz

Frequency

Number of complete waves passing a point in a second

Frequency

High frequency waves useful in fighting cancer

Gamma rays

High-frequency______ can kill cancer cells

Gamma rays

The electromagnetic waves with the shortest wavelengths are

Gamma rays

For radio reception, diffraction is

Helpful

Laser light can make _____, which are pictures that can be seen from all directions

Holograms

A laser beam would be least useful for

Illuminating A room

The light source warmest to the touch is a

Incandescent bulb

_________ rays are given off by hot objects

Infrared

Colors seen when gasoline forms a thin film on water are a demonstration of

Interference

A beam of light made up almost completely of a single frequency is produced by a

Laser

Relative to its avg speed in air, the avg speed of a beam of light in glass is

Less

Objects that produce visible light are known as

Luminous bodies

Look at a full-color picture in a magazine with a magnifying glass and you'll see that the inks used are

Magenta, cyan, yellow and black

The whiteness of clouds is evidence in the clouds for a variety of

Particle sizes

Small particles of light energy

Photons

The law of reflection holds for

Plane mirrors and curved mirrors

The main difference between a radio wave and a light wave is its speed, wavelength or frequency?

Two of these

Useful in killing germs

UV light

A sunburn is caused by the damaging effects of

UV waves

When light passes through a prism, the wavelengths refracted most are

Violet

The band of colors produced when white light is dicided into its seperate colors is calld the

Visible Spectrum

The colors of the rainbow are made up of waves of

Visible light

An iron bar has been heated to the point where it is giving off a yellow glow. Further heating will eventually cause the iron to produce light that is

White

If red, green, and blue light are combined, the result is

White light

Which of these electromagnetic waves has the shortest wavelength: radio, infrared, x-rays, uv or light waves

X-rays

Wilhelm Roentgen accidentally discovered

X-rays

________Pass through skin and tissues, but not bones

X-rays

The colored inks used to make printed color pictures are

Yellow, cyan, magenta, and black

The primary colors of paint are

Yellow, magenta, and cyan

If the angle of incidence of rays striking a plane mirror is 80 degrees, the angle of reflection is

80 degrees

The color of paints depends on which frequencies of light are ______ and which are absorbed

Reflected

As light rays move from one medium to another, they are

Refracted

The complementary color of blue is

Yellow

Colors of light that can be mixed to produce any other color are called

Primary colors

A specially shaped piece of glass called a ______ can divide white light into its separate colors

Prism

Complementary colors are two colors that

Produce white light when added together

Used to identify objects through darkness or fog

Radar waves

The electromagnetic waves with the lowest frequency are

Radio waves

Because it has the lowest frequency, _____ light is refracted the least

Red

The color found at the top of a rainbow is

Red

The wavelength of light refracted the least by a prism is

Red

List the 7 colors of the rainbow in order from lowest to highest frequency

Red Orange Yellow Green Blue Indigo Violet

Magenta light is really a mixture of

Red and blue light

A color TV picture is made by mixing lines of

Red, Blue and Green light

The colored dots that make up the color on a TV screen are

Red, blue, green

Light is _____ when it strikes a mirror

Reflected

As the frequency of an electromagnetic waves becomes higher, the wavelength becomes

Shorter

The electromagnetic spectrum does not include

Sound waves

A pair of sunglasses and a pair of clear reading glasses are left in the sunlight. The hotter glasses would be the

Sun glasses

Consider light energy that is momentarily absorbed in glass and then reemitted. Relative to the absorbed light, the frequency of the reemitted light is

The same

Relative to radio waves, the velocity of visible light waves in a vacuum is

The same